Leatheb sceap



(No Model.) B BRAGG.

APPARATUS FOR TREATING LEATHER SCRAP.-

No'. 288.001. Patented Nov. 6, 1883.

WITNESSES INVENTOR:

' ATTORNEYS.

NITED STATES PATENT EVERETT BURT BRAGG, OF NEW YORK, N. Y.

SPECIFICATION forming part of Letters Patent No. 288,001, dated November6, 1883.

Application filed March 6, 1883. (No model.)

1'0 all whom zit may concern.-

Be it known that I, Evnnnrr BURT Bnneo,

following is a full, clear, and exact descrip- Dion.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in both the figures.

Figure l is a side elevation of myimprovement, the furnace being shownin section. Fig. 2 is a front elevation ofthe same.

The object of this invention is to make leather-scrap available forfertilizing purposes.

The invention consists in an apparatus for treatingleather-scrapconstructed with asteamcylinder connectedwith aboiler by a di rect pipeand a supcrheating-pipe, and provided with a door, a wastepipe andreceiver, asteam-discharge pipe, and a thermometer, wherebyleather-scrap may be made available for fertilizing purposes, as will behereinafter fully described.

A. represents an ordinary steam-boiler capable of sustaining a pressureof two hundred and twenty-five pounds to the square inch, and

which is set in a furnace, B, in the ordinary manner.

G is a steam cylinder of corresponding strength, andprovided at one endwith a door, D, for the insertion and removal of the leatherscrap. The"door D should be packed or oth-' may be required.

With the steamspace of the boiler A is also connected the end of a pipe,H, apart of which" enters and is coiled in the fire-chamber of thefurnace B, or-in a separate fire provided for that purpose. The otherend of the pipe H is connected with the upper part of the cylinder (1.The pipe H is provided with a valve, I, for regulating and shutting offsteam, as may be required, and is intended for use in regulating andcontrolling the temperature of the contents of the cylinder C. Theboiler A is provided with a water-gage, J, and a steamgage, K, in theordinary manner.

YVith the lower part of the rear end of the cylinder G is connected awastepipe, L, provided with a valve, M, and leading into a receiver, N,for the condensed steam and the oil from the said cylinder.

With the upper part of the rear end of the cylinder 0 is connected apipe, 0, provided with a valve, P, for the discharge of steam, to keepup a circulation of steam through the apparatus. The cylinder 0 isprovided with a thermometer, Q, to show the temperature.

In using the apparatus leather-scrap without any previous treatment isplaced in the cylinder G, and the door D is closed. Steam is thengradually introduced into the cylinder 0 through the pipe E until thecontents of the said cylinder C- are raised to a temperature of from130to 140 centigrade, which temperature is maintained for about fifteenminutes. The valve M is then opened,and the water of condensation andthe oil extracted from the scrap are'blown out through the pipe L intothe receiver N. The valve M is then closed and the valve I isopened toadmit steam through the pipe H until the contents of the cylinder 0 havebeen raised to a temperature of from 180 to 200 centigrade, whichtemperature is maintained for about an hour. This temperature isrequired for producingthe best results; but an inferior product can beobtained by using a lower temperature. The inflow'of steam is then cutoif, and the water of condensation is blown off through the waste-pipe Linto the receiver N. The door Disthen opened, and the contents of thecylinder 0 are removed and taken to a drier, and when dry and ground areready for market. As the water in the receiver N cools, the oil in thesaid receiver solidifies, and can be skimmed off or otherwise removed.The water of condensation is then evaporated, and the residuum is takento the drier, and is dried and ground with the mass taken from thecylinder 0. By this process the leather-scrap is reduced to such a"condition that when brought into contact with acid- ICC nlatedfertilizers thegelatinous or nitrogenous steam-discharge pipe, 0, and athermometer, portion becomes at once putrescible, and the Q, as setforth. I nitrogen therein contained becomes available -2. Thecombination, with asteam-tight 05 1- 15 as plant-food. inder and asteam-boiler, of the pipe E, having 5 Havingthus described my invention,Iclaim a safety-valve, F, and a regulating-valve, G, as new and desireto secure Letters Patent whereby the inside of cylinder may be raised 1.An apparatus for treating leather-scrap, toand held at the desiredtemperature, as de- I constructed substantially as herein shown andscribed. described, and consisting of the boiler A, the

EVERETT BURT BRAGG.

:0 cylinder 0, the pipe E, and the superheating- \Vitnesses:

pipe H, the said cylinder being provided with J AMES T. GRAHAM, a door,D, a waste-pipeand receiver, L N, a O. SEDGWIOK.

